Hampson Russell Tutorial -

The tutorial is honest about the limitations here—specifically the ill-posed nature of the inverse problem (where multiple Earth models fit the same seismic data). It introduces and sparse-spike inversion as regularization techniques to stabilize the solution. The final output, such as the Lambda-Rho (incompressibility) versus Mu-Rho (rigidity) crossplot, provides the ultimate lithology-fluid discriminant. Gas sands show low Lambda-Rho (compressible) but moderate Mu-Rho, whereas shales show high values for both.

The pedagogical climax of the tutorial is the (B vs. A). Instead of interpreting raw amplitudes, the user learns to interpret clusters on a crossplot. The tutorial explains that water sands, shales, and gas sands occupy distinct quadrants of the A-B plane. It introduces the concept of the Shuey background trend —the line defining "wet" sediments. Deviations from this line (specifically, decreasing gradient and decreasing intercept) indicate potential hydrocarbons. This transforms interpretation from a qualitative art ("is it bright?") into a quantitative science ("does it plot in the gas sand quadrant?"). hampson russell tutorial

The foundational hurdle in AVO analysis is the complexity of the Zoeppritz equations, which describe how seismic energy partitions at a boundary between two elastic media. The Hampson–Russell tutorials address this by immediately introducing the simplifying approximations—specifically the Aki-Richards and Shuey equations. Rather than overwhelming the user with matrix algebra, the tutorial breaks the AVO response into three fundamental components: intercept (A), gradient (B), and curvature (C). Gas sands show low Lambda-Rho (compressible) but moderate

The Hampson–Russell Tutorial: A Paradigm for Bridging Theory and Practice in AVO Analysis Instead of interpreting raw amplitudes, the user learns

The tutorial transitions from theory to application by addressing real-world seismic noise. It instructs users on how to generate (stacking multiple Common Depth Points to increase signal-to-noise ratio) and how to perform angle stacks (near, mid, and far). The key technical innovation taught here is the weighted stacking process to solve for intercept (A) and gradient (B).

In the field of exploration geophysics, the gap between theoretical rock physics and practical seismic interpretation is often wide and fraught with pitfalls. While academic textbooks provide the governing equations (such as the Zoeppritz equations) and logging tools measure physical properties, the challenge lies in translating one into the other. Few resources have done more to bridge this gap than the Hampson–Russell Tutorial series. Developed by the software and training company Hampson–Russell, a subsidiary of CGG, these tutorials are not merely software manuals; they are pedagogical cornerstones that have educated a generation of geophysicists on Amplitude Versus Offset (AVO) analysis. This essay argues that the Hampson–Russell tutorial system succeeds because it integrates rigorous mathematical theory with empirical well-log calibration, creating an iterative workflow that transforms seismic data from a structural mapping tool into a quantitative predictor of lithology and fluid content.